One Stop Shop Marker:
Press Up, Up, Down, Down, Left, Right, Up, Down at the "Press Start" screen. A special marker for the Junkman Engine part will appear in the back room of the One Stop Shop in career mode. This code can only be enabled once per career.

Unlock Burger King challenge:
Press Up, Down, Up, Down, Left, Right, Left, Right at the "Press Start" screen. Complete the challenge and you will be able to use all Junkman parts on cars you have in "My Cars".

Bonus $10,000:
To get an extra $10,000 in career mode, have a Need For Speed Underground career game saved on your memory card. After the prologue you will get $10,000.